__TEST #15 : Additional
measurements with the GEGENE v1.3__

*created on december 28, 2012 - ***JLN
Labs*** - last update january 17, 2013
*All informations and
diagrams are published

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__January 17, 2013__
- __TEST #15 __: Here is a new serie of
additional measurements to the TEST#14 on the GEGENE v1.3. The
purpose of this test is to improve the accuracy of the current
measurements via the non inductive 0.1 Ohm resistance (Mundorf
MR10 10W) by removing all potential risks which may interfere
with the measurement.

In the previous
configuration used in the TEST#14, the Ch2 probe of the
oscilloscope is connected accross the 0.1 Ohm resistor. The
length of this resistor is 50 mm, so there is a possibility that
the voltage measurement can be jammed by the magnetic field
flowing around this resistor. This magnetic field around the
resistance may eventually induce an additional parasitic voltage
which can trouble the measurement. Below, a diagram which shows
the effect of the magnetic field surrounding the resistance on
the measurement loop of the Ch2 probe. Thanks to * zgreudz* for his relevant remark
about this :

To check if the presence of the triangular loop (the pink surface) is able to create trouble in the current measurement, I have built a new setup for the measurement of the current so as to reduce this surface near to zero and thus to nullify the electromagnetic interference produced by the magnetic field surrounding the resistance. Here this new setup :

In this setup, the influence of the magnetic field surrounding
the resistance is negligible.

The exact value of the resistance is 0.09 Ohm.

__Here the new tests results on the TEST#15__

I have used the same loads at the GEGENE v1.3 output than in the
TEST#14 : for a total of** 3550 W of halogen lamps**.

In this test, the output power has been limited to the level 5/10 i.e. at the middle power (about 1200 W).

To
measure the voltage and the current at the output for powering
the halogen lamps, the two scope probes are set to X10 and are
connected to the flat bifilar coil output. The probe Ch1 is used
to measure the voltage accross the flat bifilar coil output and
the probe Ch2 is used to measure the current i.e. the voltage
accross a 0.1 Ohm __non inductive resistor__ Mundorf MR10 10W.
Then the datas are sent to a datasheet to compute true RMS values
and the efficiency. The electrical power input of the induction
cooker is measured with a Wattmeter Energy Logger 4000F directly
connected on the power grid.

The electrical power for the induction cooker is measured with a Wattmeter Energy Logger 4000F directly connected on the power grid :

The Wattmeter measures 1148 Watt at the INPUT of the induction
cooker.

Above the True RMS voltage measured by the Rigol digital
oscilloscope.

So
as to get a good accuracy of the measured values for the
mathematical computation, the sampling rate has been set to 20.00 MSa/s

We
can observe that there is __no phase shift between the voltage
and the current__ measured.

Below, the scope datas computed with GNU Octave 3.2.4 (freeware and full compatible version of MATLAB)

We can also observe that the computed RMS current is very close to
the measured value in real time by the digital oscilloscope...

You may download my full PowerCalc v1.01 software with the scope datas used in this test, HERE

Under Octave launch power_calc

__Comments__
: According to
the results of this TEST#15, we can say that the electromagnetic
disturbance on the Ch2 by the magnetic field surrounding the
resistor is really negligible on the measurements and the
computations of the power output of the GEGENE.

NEXT TEST :

Stay tuned,

Email: jnaudin509@aol.com